A flagship product for ODIN Works, the XMR (eXtended Magazine Release) is one accessory every AR needs. Machined from billet 6061 aluminum and designed to work with KNS pins. The XMR is 4x larger than a mil spec button making it easily accessible by all shapes and sizes of hands and fingers. Works with both AR15 lower receivers. Simple install takes only minutes, allen wrench included. Mfg: Odin Works Inc.